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LEASES - Lease Payments for Operating Leases (Details)
$ in Millions
Mar. 31, 2019
USD ($)
Lessee, Lease, Description [Line Items]  
2019 $ 15.6
2020 18.7
2021 15.3
2022 12.4
2023 9.4
After 2023 52.4
Total operating lease payments 123.8
Amounts representing imputed interest (20.8)
Present value of lease payments 103.0
Less: current portion (16.1)
Total long-term obligations under operating leases $ 86.9
Weighted-average lease term (years) 9 years 4 months 1 day
Weighted-average discount rate 3.90%
Westar Energy  
Lessee, Lease, Description [Line Items]  
2019 $ 9.5
2020 10.2
2021 7.3
2022 5.1
2023 2.6
After 2023 2.8
Total operating lease payments 37.5
Amounts representing imputed interest (2.7)
Present value of lease payments 34.8
Less: current portion (10.5)
Total long-term obligations under operating leases $ 24.3
Weighted-average lease term (years) 4 years 2 months 1 day
Weighted-average discount rate 3.40%
KCP&L  
Lessee, Lease, Description [Line Items]  
2019 $ 7.6
2020 10.6
2021 10.1
2022 9.3
2023 8.8
After 2023 91.3
Total operating lease payments 137.7
Amounts representing imputed interest (38.4)
Present value of lease payments 99.3
Less: current portion (6.3)
Total long-term obligations under operating leases $ 93.0
Weighted-average lease term (years) 16 years 2 months 1 day
Weighted-average discount rate 4.10%